Cablislek



25 anhydrous calcium sulfate.

40 packing, is a preferable type ofthis extending mama Au 6, 1929.-

UNITED- STATES Re.- 17394. PATENT OFFICE. 7

cmrsLn x. BQOS, or arms ELLYN, rumors, assrenon "r unrrnn s'rnrns. exrsml: oomrm, or cnrcaeo, rLLmoIs, A conrona'rron or rnnmoIs' SURFACING MATERIAL.

Io Drawing. Original No. 1,606,722, dated November 9, 1926, serial No. 733,198, filed August 20, 152A.

Application for reissue filed September 1, 1927., Serial No. 217,009.

heads or any surface defect. Ordinary oil wvall paints and caloimines on account of their 16 thin film and relatively smooth surface are incapable of accomplishing this as satisfactorily. i I

i The composition of this surfacing material in accordance with this invention consists of 20 a binder such as casein or ordinar. glue, a fibrous extender of light asbestos fiber (air separated to produce short lengths) anonsiliceous load ng filler such as fine round natural anhydrite, gypsum, or dead urned The'specific advantageous properties of my wall surfacer are due to the characteristics of the particular type of particle -aggreg ;ations makin up the bodyiof the composition. In ad 'tion to a binder of nitrogenous adhesive, I combine into a body material, a siliceous ingredient or' ingredients, the particlesof which are foliate, like talc, or schistose like sericite and arranged in fibriform or v feathery assembly as distinguished from cubical or spheriodal; the hydrous'silicate asbestos when powdered and separated to pro' duce minute particles which render such 1 material light, flufiy or downy, and noncomponent; With material of such proper;

1 ties I combine'a heavier non-siliceous loading filler, the individual particles of' which are platonic or frotund bodied and also do not soften and disintegrate when mixed with water like friable clays, kaolin, shales and similar earthy siliceous materials. Thus, when'ground to minute articles, this filler is close ackin and wei ting in character rather t an aky and flufly, and so, fine ground natural anhydriteor-other relatlvely insoluble alkaline earth compounds are preferred materials. Thus, this complete body material when wetted to a paste furnishes the combined properties ofa light, easy working, wet lastic mortar which will dry to a surfaceo high density because'of these heavy filler particles segregating in between the wet extended fibrous or foliate particles and as drying proceeds, composite packing together no ensues whereby the extended particles are held securely in all directions internally, finally yielding a dry, dense, tough wall surfac- 1n without checks, cracks and other surface de ects. V ea As it is desirable to produce a moderately washable surface, it is preferred to use casein with a weak alkalisuch as borax, as the hinder, together with hydrated lime to promote fly insoluble and heavy white material now considered a waste by-product. It has the ,desirable' effect, together with lithopone, of weighing down the asbestos fibers and causing them to lay flat.

he fine ground 'anhydrite is a desirable fillv er for when available, is aninexpensive insol; uble and heav weight material,.the particles washability; In this formula the borax 70 v of which are platonic or rotund bodied, g5 7 depending on the nature of the deposit. However, the variable nature of anhydrite deposits often exhibits a complete change in particle structure and assembly in continuous parts of the vein which chan necessitate the-admixture of equivalent 0 aracter of material, such as other insoluble alkaline earth compounds, to maintain the uniform and necessary properties of this filling material. p An example of a desirable formula, consists .of casein 12 parts, borax 2 parts, fine ground asbestos fiber 40-50 parts, fine ground" anhydrite20-25 vparts, a pigment such as lithopone 15:20 parts, hydrated dolomite 10o lime 5-parts;

The main problem in decoration of noni shrinkable wallboard construction is the con i cealment of the j oinin edges and the prover A tion ofhair line crac s at the joints.- The asbestos fiber besides producing bulk and slip to the surfacing aids very materially in preventing these minute cracks by virtue of its fibrous 'reinforcingstructure.

Specifically, finely powdered amphibole with its feathery bulk, induces easy working properties because of its talc-like nature; also, ecause of its foliate and fibriform assembly of particles it bridges over and prevents the minute joint cracks normally occurring in wallboard construction.

The constituents of the finish are blended together dry and made ready for use by the mechanic through the addition of water, mixing the preparation to a moderately heavy After the wallboard joints have been aste filled with the same preparation mixed to a stiff putty, the finish is applied to the wall board with a wide wallbrush', and while still in a moist condition is stippled, sponged,

troweled or otherwise tooled to produce .various wall plaster texture effects. It is usually applied in one coat to a thickness of 1/32 to Ll/16inch. It is here that the bulky fibrous or feathery character of the asbestos permits the finish to be built up to considerable thickness without running or sagging on the wall.

One coat "of this composition has greater hiding power and obscures the .wallboard joinin'gs better than three coats ofoil, paint or calcimine, hence the economical features are obvious.

While this, finish can be tinted with lime proof colors, it is also entirely practical to subsequently paint it with ordinary oil paints and lazes at I claim is: 1. A surfacing material adapted to be dered pasty or plastic by the addition of stantially the proportions specified. t

in borax til water comprising twelve parts of casein, two parts 7 of borax, approximately forty-five parts of asbestos fibers, approximately twenty-two parts of fine ground natural anhypone and. five parts of hydrated lime all 1 blended to ether.

2. A sur acing material adapted be rendered pasty or plastic bythe addition of water, comprising .casein, borax, asbestos fibre, natural anhydrite, lithopone and hydrated lime all blended together dry in sub- 3. A surfacing material comprising casemineral fibres and natural anhydrite. be ground fine, lithopone, and by drated dolomite lime, all blended together dry, then sufiicient water added to render the mass pasty.

4:. A surfacin material comprising casein, borax, mineral fibres and anhydrous calcium sulphate both ground fine, lithopone, and hydrated lime, all blended together dry, and

suflicient water to render the mass pasty.

5. A surfacing material comprising casein, a weak alkali, a siliceous extender, hydrated lime, finely ground insoluble matter containing alkaline earth compounds, and lithopone,

all blended together dry, and adapted to be rendered cation.

'6. A dry, powdered surfacing material plastic with water for brush applicomprising a nitrogenous adhesive as a binder, a weak alkali, hydrated lime, asbestos, insoluble alkaline earth compounds and lithopone, all blended together dry and adapted to be rendered plastic with 'Water for brush application. a

I dere'd drite, approximately seventeen parts of litho- 7. A surfacing material comprising a nitrogenous adhesive as a binder, a weak alkali, hydra-ted lime, a siliceous extender, relatively insoluble calcium sulphate and lithoand adapted to be rendered plastic with water for brush application.

8. A surfacing material comprising a nitrogenous adhesive as a binder, a weak alkali, a siliceous extender, relatively insoluble alkaline earth compounds and lithopone, all blended together dry and adapted to be renplastic with water for brush application.

pone as pigment, all blended together dry I 9o 9. A surfacing material comprising casein glue, lithopone, relativelyvinsoluble calcium the proportions named.

\ CARLI-SLE K. ROOS.

for plaster wall- I i 

